Pulverizer



May 30, 1933. w 1,911,193

PULVERIZER Filed Oct. 7, 1927 2 Sheets-Sheet l 29 8 Walter fiW/T TTomvEY. V

W. M. HILL PULVERIZER May 30, 1933.

Filed Oct. '7, 192-7 2 Sheets-Sheet m/rer M, W7

A TORNEY Patented May 30, 1933 UNITED STATES PATENT OFFICE WALTER M. HILL OF HUDSON, COLORADO, ASSIGNOR TO JAMES D. CANARY, OF LITTLETON, COLORADO PULVERIZER Application filed October 7, 1927. Serial No. 224,614.

This invention relates to pulverizers of the type in which the coarse material is by centrifugal force, violently thrown against a stationary breaking element and thereby reduced to a desired fineness, in a series of successive actions.

It is an object of the invention to provide a machine of the above-stated character, so constructed that the material is progressed for its successive treatments in the most simple and efficient manner.

Another object is to provide certain new and useful improvements in the impelling members by which the material is thrown against the relatively stationary breaking element, principal among which are the use of rubber or other resilient and wear resisting material in the construction'of the members, and the employment of means for adjusting the members to take up wear and to vary the angle at which the material is impelled.

Further objects of the invention are to be found in details of construction and novel arrangements and combinations of parts as fully set forth in the course of the following description.

In the accompanying drawings in the several views of which like parts are similarly designated,

Figure 1 represents a vertical sectional el vation of the improved pulverizer,

Figure 2, asectional plan view, showing parts of the machine at different elevations designated by tl e lines 2-2, 3- 3, and 4-4 in Figure 1, I

Figure 3, a fragmentary horizontal section on the line 2-2 Figure 1, showing the y to construction and arrangement of the impelling members on a larger scale.

Figure 4., a fragmentary vertical section of a portion of the pulverizer, illustrating a modification in the construction thereof,

Figure 5, an enlarged sectional view of one of the impelling members, takenon the line 5-5, Figure 3,

Figure 6, a view similar to Figure 5, showing a. modification in the construction of the member, and

cylindrical pulverizing compartments 6 of progressively increased diameters. Inside the compartments are rotary impelling ele ments, mounted upon a vertical shaft 7 coaxial with the housing.

Each element comprises a disk 8 having a hub 9 for its connection with the shaft, and

a plurality of hammers 10 mounted at substantially equal distances from each other at the periphery of the disk. It is preferred.

to increase the numbers of the hammers in proportion to the diameters of the disks,

so for example, the three disks shown in Figure 2, carry respectively, four, eight and twelve hammers.

The housing is fastened upon a heavy base 12 provided with openings 13 for the passage of the finished product into a hopper let terminating in a discharge spout 15. In the construction shown in the drawings the hopper and the spout are formed integral with a foundation structure loupon which the base is supported, but it is to be understood that the discharge conduit may be sep arately arranged, particularly if, as frequently occurs, the machine is mounted upon a foundation of cement or other similar material.

A hood l7 surmounted on the housing has an inlet 18 into which the material is fed in the operation of the machine.

The impelling elements are supportd one upon another on the shaft, the lowermost element rests upon a step bearing 19 on the base, into which the shaft extends. A collar 20 on the shaft engages the hub of the uppermost element, and the upper portion of the shaft extends through a bearing 21 on the hood.

A pulley 22 on the shaft above the machine provides for its connection with a conveniently located source. of energy. Inside the pulverizing compartments are breaker rings 23 that are fastened inside the peripheral walls of the compartments to receive the impact of the material thrown outwardly by the hammers during rotation of the shaft. The breaker rings may be toothed or corrugated interiorly to better and more expeditiously break the material to the required size.

The disks are proportioned relative to the respective breaker rings so that the annular spaces 24 between the rings and the disks are decreased in width progressively from the upper compartment to the lower one, whereby the material in order to pass through the spaces must be gradually reduced to sizes of increasing fineness.

The disks are spaced in close proximity to the horizontal planes of the upper surfaces of the hammers on the disks immediately below the others and each upper disk is in diameter smaller than the circle of the inner ends of the hammers on the next lower disk so that the material delivered through the annular space 24 of each upper compart ment must fall onto the middle portion of the next following disk and away from the marginal portion at which the hammers are disposed.

This last-mentioned feature of the con struction is of paramount importance since it insures a continuous feed of material from one compartment to another in the right position for its proper and immediate propulsion under the influence of centrifugal force, and eliminates the space occupied by undesirable hoppers or funnels found in other machines of similar type.

The presence of hoppers frequently causes clogging and consequent interruptions in the effective operation of the machine and any occurrence of this kind is obviously completely avoided in the present machine.

The hammers in their preferred form, are rectangular and composed of a metal core 25 and a band 26 of rubber or other suitable resilient substance. It is to be understood, however, that under certain conditions the hammers may be made completely of metal or completely of softer material if so desired.

In the construction shown in Figure 6, the hammers are fastened on the disks by means of two bolts 27 passing through alined openings of'the disk and the cores of the hammers. The hammers are thus immovably fastened and they may be reversed to expose different sides and corners for their action upon the material. The hammers are preferably arranged at an angle to the radii of the disks passing through their points of nearest approach of their forward sides to the periphery thereof, this having been found to produce the most efficient action in their impellent effect upon the material.

By making the hammers partially or entirely of a resilient substance, wear is reduced and a more positive movement of the material toward the breaker rings is effected.

As stated hereinbefore the position of the hammers may be reversed to place different sides or edges thereof forwardly for their action upon the material and the period of usefulness of the hammers in thus materially lengthened.

It is under certain conditions also to advantage to vary the angle of the working face of the hammers with respect to the periphery of the disk on which they are mounted and a convenient method of accomplishing this result has been illustrated in Figures 3, 5 and 7.

The hammers are fastened by means of a single bolt 28 inserted through a; central opening of the hammer into a therewith alined aperture of the disk. Nuts 29 on the bolts 28 secure the hammers in their adjusted positions and meshing ribs 30 and grooves 31 on the engaging surfaces of the disks and the hammers arranged radially with respect to their alined bolt holes, prevent rotative movement of the hammers about the bolts.

In Figure 3, one of the hammers has been shown in two different positions. It will be noted that the change in angles, varies the distance through which the material is impelled toward the breaker ring and that in this manner the force of the impact may be regulated according to varying circumstances.

In case it is desired to deliver the material from the different compartments at still closer proximity to the surfaces of the lower disks the breaker rings may be extended within the circle of the hammers on the disks as illustrated in Figure 4 or the same result may be attained by rims on the housing or rings clamped between the housing and the breaker rings all of which appears too obvious for further illustration.

In the operation of the pulverizer, the material fed through the opening 18 into the upper compartment and from each compartment through the annular space 24 around the respective impelling element, into the next lower compartment, is impelled by the hammers on the rapidly rotating disks to forcibly engage the breaker rings under centrifugal force.

The material is thrown back and forth in the compartments until it is sufficiently reduced to pass through the spaces 24 and the final product is delivered through the spout into a suitable and conveniently located receptacle.

The advantages of the novel features of the invention have been fully described hereinbefore and what I claim and desire to secure by Letters Patent is:

1. In a centrifugal pulverizer, a housing, a rotor in the housing, including a plurality of impeller disks positioned one above another and series of hammers at the peripheries of the disks, each upper disk being smaller in diameter than the inner circle of the hammers on the next lower disk, and 5 breaker rings in the housing spaced from the peripheries of the disks, and projecting downwardly within said circle of the hammers.

2. In a centrifugal pulverizer, a rotary disk having a bolt-hole, a hammer at the periphery of the disk, having a correspond- In testimony whereof I have afiixed my signature.

WALTER M. HILL.

ing bolt-hole, and a bolt in the bolt holes fastening the hammer on the disk for rotary adjustment, the disk having grooves radiat ing from its bolt-hole and the hammer having a rib radiating from its bolt hole and adapted to enter any one of the grooves to lock the hammer in its adjusted positions on the disk.

3. A grinding mill comprising a series of horizontal disks of progressively increasing diameters, mounted for conjunctive rotation about a common vertical axis, the disk of smallest diameter being uppermost, a stationary housing having breaking surfaces spaced from the peripheries of the disks, and hammers substantially within the pe ripheries of the disks, each upper disk being immediately above the next lower disk and peripherally inside a vertical extension of the inner circle of the hammers on the lower disk, whereby material passing across the periphery of each upper disk will fall on to the next lower disk within the circle of its hammers, and the housing having means for feeding material on to the upper disk, and means for discharging material delivered across the periphery of the lower disk.

4. In a centrifugal pulverizer, a horizontal disk mounted to rotate about a vertical axis, a reversible hammer having similar working faces at opposite sides and mounted to present one or the other of its working faces as the periphery of the disk, the disk and hammer having cooperating means to hold the hammer in either of its positions, a resilient covering for the faces of the hammer, and a housing having a breaking surface spaced from the periphery of the disk.

5. In a centrifugal pulverizer, a horizontal impeller disk mounted to rotate about a vertical axis, an adjustable hammer upon the upper face of the disk at the periphery thereof, the abutting faces of the disk and hammer having meshing parts adapted to engage when the hammer is in any of its positions, a bolt holding the hammer on the disk and holding said parts in mesh, and a stationary housing having a breaking surface spaced from the periphery of the disk.

6. In a centrifugal pulverizer, a horizontal impeller disk mounted to rotate about a vertical axis, an adjustable hammer on the disk, 65 the abutting faces of the disk and hammer 

